Preparation method of silicon-steel grade magnesium oxide

A magnesia, silicon steel grade technology, applied in magnesia and other directions, can solve the problems of magnesia multiple quality defects, product quality fluctuations, low reaction temperature, etc., achieve uniform particle size distribution, improve automation level, low impurity content Effect

Active Publication Date: 2015-06-17
上海实业振泰化工有限公司
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Problems solved by technology

[0003] The magnesium oxide produced by the general continuous process has many quality defects and cannot be used as a raw material for grain-oriented silicon steel.
In the traditional production process of silicon steel grade magnesium oxide, most of them use conventional reactors for production and preparation of semi-finished products, whic

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  • Preparation method of silicon-steel grade magnesium oxide

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Embodiment Construction

[0028] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention will be further explained below.

[0029] A method for preparing silicon steel grade magnesium oxide includes the following steps:

[0030] 1) Ingredients and impurity removal: Put the crude magnesium oxide powder into a container, add pure water for mixing, and wash and remove impurities from the prepared slurry. The container can use equipment such as ultrasonic or dispersion mill. In order to achieve the effect of uniformly dispersing the powder in water, a high-speed mixer is preferably used.

[0031] 2) Rotating bed high temperature treatment: the slurry obtained in step 1) is pumped into a rotating bed reactor for reaction to obtain a slurry. The rotating bed reactor uses superheated steam heating mode to work. The temperature of steam fed into the rotating reactor is between 100°C and 140°C, the temperature of the output ma...

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Abstract

The invention relates to the technical field of magnesium oxide production, and concretely relates to a preparation method of magnesium oxide. The method comprises the following steps: 1)placing the crude magnesium oxide powder in a container, adding pure water for blending, washing a blended slurry to remove impurities, 2)pumping the slurry into a revolving bed reactor for reacting to obtain a slip, 3)aging the slip and separating to obtain magnesium hydroxide, drying, and 4)placing magnesium hydroxide in a high temperature calciner, employing a dynamic calcining method for calcining to obtain the magnesium oxide particles, and crushing and grading to obtain the silicon-steel grade magnesium oxide. Compared with a traditional silicon-steel grade magnesium oxide, the silicon-steel grade magnesium oxide produced by the invention has the advantages of low impurity content, uniform and adjustable particle size particle size distribution, low hydration rate, good suspensibility and stable quality.

Description

Technical field [0001] The invention relates to the technical field of magnesium oxide manufacturing, in particular to a method for preparing magnesium oxide used in the production of silicon steel sheets. Background technique [0002] Silicon steel grade magnesium oxide is mainly used in the production of oriented silicon steel sheets. In a high temperature environment, magnesium oxide is first used as a tempering release agent for steel sheets to prevent the steel sheets from bonding. At the same time, magnesium oxide should form an excellent insulating film on the surface of the silicon steel sheet and the substrate, and can also remove sulfur in the silicon steel during high-temperature reactions. And phosphorus and other harmful impurities. [0003] Magnesium oxide produced by a general continuous process has many quality defects and cannot be used as a raw material for oriented silicon steel. In the traditional production process of silicon steel grade magnesium oxide, most...

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Application Information

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IPC IPC(8): C01F5/02
CPCC01F5/02
Inventor 傅涛宗俊武艳妮徐艳霞
Owner 上海实业振泰化工有限公司
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